Roboguru

Diketahui dalam 1 liter air sebesar . Jika ke dalam wadah tersebut ditambahkan sedikit HCl, tentukan nilai pH larutan sebelum penambahan HCl!

Diketahui begin mathsize 14px style K subscript sp space kristal space Mg open parentheses O H close parentheses subscript 2 end style dalam 1 liter air sebesar begin mathsize 14px style 1 comma 2 cross times 10 to the power of negative sign 11 end exponent end style. Jika ke dalam wadah tersebut ditambahkan sedikit HCl, tentukan nilai pH larutan begin mathsize 14px style Mg open parentheses O H close parentheses subscript 2 end style sebelum penambahan HCl!

Jawaban:

Langkah pertama hitung konsentrasi begin mathsize 14px style O H to the power of minus sign end style pada larutan begin mathsize 14px style Mg open parentheses O H close parentheses subscript 2 end style 

 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell K subscript sp space Mg open parentheses O H close parentheses subscript 2 end cell equals cell 4 s cubed end cell row cell 1 comma 2 cross times 10 to the power of negative sign 11 end exponent end cell equals cell 4 s cubed end cell row s equals cell cube root of 3 cross times 10 to the power of negative sign 12 end exponent end root end cell row blank equals cell 1 comma 44 cross times 10 to the power of negative sign 4 end exponent end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell 2 s end cell row blank equals cell 2 cross times 1 comma 44 cross times 10 to the power of negative sign 4 end exponent end cell row blank equals cell 2 comma 88 cross times 10 to the power of negative sign 4 end exponent end cell end table end style 

Langkah berikutnya menentukan pOH dan pH

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pOH equals cell negative sign log open parentheses O H to the power of minus sign close parentheses end cell row blank equals cell negative sign log left parenthesis 2 comma 88 cross times 10 to the power of negative sign 4 end exponent right parenthesis end cell row blank equals cell 4 minus sign log space 2 comma 88 end cell row pH equals cell 14 minus sign pOH end cell row blank equals cell 14 minus sign left parenthesis 4 minus sign log space 2 comma 88 right parenthesis end cell row blank equals cell 10 plus log space 2 comma 88 space end cell end table end style 

 jadi, pH larutan begin mathsize 14px style Mg open parentheses O H close parentheses subscript 2 end style sebelum penambahan HCl adalah 10 + log 2,88

 

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